disk_link.c revision 4876:ecd69ba0713a
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26#pragma ident "%Z%%M% %I% %E% SMI" 27 28#include <devfsadm.h> 29#include <stdio.h> 30#include <strings.h> 31#include <stdlib.h> 32#include <limits.h> 33#include <sys/stat.h> 34#include <bsm/devalloc.h> 35 36#define DISK_SUBPATH_MAX 100 37#define RM_STALE 0x01 38#define DISK_LINK_RE "^r?dsk/c[0-9]+(t[0-9A-F]+)?d[0-9]+(((s|p))[0-9]+)?$" 39#define DISK_LINK_TO_UPPER(ch)\ 40 (((ch) >= 'a' && (ch) <= 'z') ? (ch - 'a' + 'A') : ch) 41 42#define SLICE_SMI "s7" 43#define SLICE_EFI "" 44 45#define MN_SMI "h" 46#define MN_EFI "wd" 47#define ASCIIWWNSIZE 255 48 49extern int system_labeled; 50 51static int disk_callback_chan(di_minor_t minor, di_node_t node); 52static int disk_callback_nchan(di_minor_t minor, di_node_t node); 53static int disk_callback_wwn(di_minor_t minor, di_node_t node); 54static int disk_callback_fabric(di_minor_t minor, di_node_t node); 55static void disk_common(di_minor_t minor, di_node_t node, char *disk, 56 int flags); 57static char *diskctrl(di_node_t node, di_minor_t minor); 58static int reserved_links_exist(di_node_t node, di_minor_t minor, int nflags); 59 60 61static devfsadm_create_t disk_cbt[] = { 62 { "disk", "ddi_block", NULL, 63 TYPE_EXACT, ILEVEL_0, disk_callback_nchan 64 }, 65 { "disk", "ddi_block:channel", NULL, 66 TYPE_EXACT, ILEVEL_0, disk_callback_chan 67 }, 68 { "disk", "ddi_block:fabric", NULL, 69 TYPE_EXACT, ILEVEL_0, disk_callback_fabric 70 }, 71 { "disk", "ddi_block:wwn", NULL, 72 TYPE_EXACT, ILEVEL_0, disk_callback_wwn 73 }, 74 { "disk", "ddi_block:cdrom", NULL, 75 TYPE_EXACT, ILEVEL_0, disk_callback_nchan 76 }, 77 { "disk", "ddi_block:cdrom:channel", NULL, 78 TYPE_EXACT, ILEVEL_0, disk_callback_chan 79 }, 80}; 81 82DEVFSADM_CREATE_INIT_V0(disk_cbt); 83 84/* 85 * HOT auto cleanup of disks not desired. 86 */ 87static devfsadm_remove_t disk_remove_cbt[] = { 88 { "disk", DISK_LINK_RE, RM_POST, 89 ILEVEL_0, devfsadm_rm_all 90 } 91}; 92 93DEVFSADM_REMOVE_INIT_V0(disk_remove_cbt); 94 95static devlink_re_t disks_re_array[] = { 96 {"^r?dsk/c([0-9]+)", 1}, 97 {"^cfg/c([0-9]+)$", 1}, 98 {"^scsi/.+/c([0-9]+)", 1}, 99 {NULL} 100}; 101 102static char *disk_mid = "disk_mid"; 103static char *modname = "disk_link"; 104 105int 106minor_init() 107{ 108 devfsadm_print(disk_mid, 109 "%s: minor_init(): Creating disks reserved ID cache\n", 110 modname); 111 return (devfsadm_reserve_id_cache(disks_re_array, NULL)); 112} 113 114static int 115disk_callback_chan(di_minor_t minor, di_node_t node) 116{ 117 char *addr; 118 char disk[20]; 119 uint_t targ; 120 uint_t lun; 121 122 addr = di_bus_addr(node); 123 (void) sscanf(addr, "%X,%X", &targ, &lun); 124 (void) sprintf(disk, "t%dd%d", targ, lun); 125 disk_common(minor, node, disk, 0); 126 return (DEVFSADM_CONTINUE); 127 128} 129 130static int 131disk_callback_nchan(di_minor_t minor, di_node_t node) 132{ 133 char *addr; 134 char disk[10]; 135 uint_t lun; 136 137 addr = di_bus_addr(node); 138 (void) sscanf(addr, "%X", &lun); 139 (void) sprintf(disk, "d%d", lun); 140 disk_common(minor, node, disk, 0); 141 return (DEVFSADM_CONTINUE); 142 143} 144 145static int 146disk_callback_wwn(di_minor_t minor, di_node_t node) 147{ 148 char disk[10]; 149 int lun; 150 int targ; 151 int *intp; 152 153 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, 154 "target", &intp) <= 0) { 155 return (DEVFSADM_CONTINUE); 156 } 157 targ = *intp; 158 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, 159 "lun", &intp) <= 0) { 160 lun = 0; 161 } else { 162 lun = *intp; 163 } 164 (void) sprintf(disk, "t%dd%d", targ, lun); 165 166 disk_common(minor, node, disk, RM_STALE); 167 168 return (DEVFSADM_CONTINUE); 169} 170 171static int 172disk_callback_fabric(di_minor_t minor, di_node_t node) 173{ 174 char disk[DISK_SUBPATH_MAX]; 175 int lun; 176 int count; 177 int *intp; 178 uchar_t *str; 179 uchar_t *wwn; 180 uchar_t ascii_wwn[ASCIIWWNSIZE]; 181 182 if (di_prop_lookup_strings(DDI_DEV_T_ANY, node, 183 "client-guid", (char **)&wwn) > 0) { 184 if (strlcpy((char *)ascii_wwn, (char *)wwn, sizeof (ascii_wwn)) 185 >= sizeof (ascii_wwn)) { 186 devfsadm_errprint("SUNW_disk_link: GUID too long:%d", 187 strlen((char *)wwn)); 188 return (DEVFSADM_CONTINUE); 189 } 190 lun = 0; 191 } else if (di_prop_lookup_bytes(DDI_DEV_T_ANY, node, 192 "port-wwn", &wwn) > 0) { 193 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, 194 "lun", &intp) > 0) { 195 lun = *intp; 196 } else { 197 lun = 0; 198 } 199 200 for (count = 0, str = ascii_wwn; count < 8; count++, str += 2) { 201 (void) sprintf((caddr_t)str, "%02x", wwn[count]); 202 } 203 *str = '\0'; 204 } else { 205 return (DEVFSADM_CONTINUE); 206 } 207 208 for (str = ascii_wwn; *str != '\0'; str++) { 209 *str = DISK_LINK_TO_UPPER(*str); 210 } 211 212 (void) snprintf(disk, DISK_SUBPATH_MAX, "t%sd%d", ascii_wwn, lun); 213 214 disk_common(minor, node, disk, RM_STALE); 215 216 return (DEVFSADM_CONTINUE); 217} 218 219/* 220 * This function is called for every disk minor node. 221 * Calls enumerate to assign a logical controller number, and 222 * then devfsadm_mklink to make the link. 223 */ 224static void 225disk_common(di_minor_t minor, di_node_t node, char *disk, int flags) 226{ 227 char l_path[PATH_MAX + 1]; 228 char sec_path[PATH_MAX + 1]; 229 char stale_re[DISK_SUBPATH_MAX]; 230 char *dir; 231 char slice[4]; 232 char *mn; 233 char *ctrl; 234 char *nt = NULL; 235 int *int_prop; 236 int nflags = 0; 237 238 if (strstr(mn = di_minor_name(minor), ",raw")) { 239 dir = "rdsk"; 240 } else { 241 dir = "dsk"; 242 } 243 244 if (mn[0] < 113) { 245 (void) sprintf(slice, "s%d", mn[0] - 'a'); 246 } else if (strncmp(mn, MN_EFI, 2) != 0) { 247 (void) sprintf(slice, "p%d", mn[0] - 'q'); 248 } else { 249 /* For EFI label */ 250 (void) sprintf(slice, SLICE_EFI); 251 } 252 253 nflags = 0; 254 if (system_labeled) { 255 nt = di_minor_nodetype(minor); 256 if ((nt != NULL) && 257 ((strcmp(nt, DDI_NT_CD) == 0) || 258 (strcmp(nt, DDI_NT_CD_CHAN) == 0) || 259 (strcmp(nt, DDI_NT_BLOCK_CHAN) == 0))) { 260 nflags = DA_ADD|DA_CD; 261 } 262 } 263 264 if (reserved_links_exist(node, minor, nflags) == DEVFSADM_SUCCESS) { 265 devfsadm_print(disk_mid, "Reserved link exists. Not " 266 "creating links for slice %s\n", slice); 267 return; 268 } 269 270 if (NULL == (ctrl = diskctrl(node, minor))) 271 return; 272 273 (void) strcpy(l_path, dir); 274 (void) strcat(l_path, "/c"); 275 (void) strcat(l_path, ctrl); 276 (void) strcat(l_path, disk); 277 278 /* 279 * If switching between SMI and EFI label or vice versa 280 * cleanup the previous label's devlinks. 281 */ 282 if (*mn == *(MN_SMI) || (strncmp(mn, MN_EFI, 2) == 0)) { 283 char *s, tpath[PATH_MAX + 1]; 284 struct stat sb; 285 286 s = l_path + strlen(l_path); 287 (void) strcat(l_path, (*mn == *(MN_SMI)) 288 ? SLICE_EFI : SLICE_SMI); 289 /* 290 * Attempt the remove only if the stale link exists 291 */ 292 (void) snprintf(tpath, sizeof (tpath), "%s/dev/%s", 293 devfsadm_root_path(), l_path); 294 if (lstat(tpath, &sb) != -1) 295 devfsadm_rm_all(l_path); 296 *s = '\0'; 297 } 298 (void) strcat(l_path, slice); 299 300 (void) devfsadm_mklink(l_path, node, minor, nflags); 301 302 /* secondary links for removable and hotpluggable devices */ 303 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "removable-media", 304 &int_prop) >= 0) { 305 (void) strcpy(sec_path, "removable-media/"); 306 (void) strcat(sec_path, l_path); 307 (void) devfsadm_secondary_link(sec_path, l_path, 0); 308 } 309 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "hotpluggable", 310 &int_prop) >= 0) { 311 (void) strcpy(sec_path, "hotpluggable/"); 312 (void) strcat(sec_path, l_path); 313 (void) devfsadm_secondary_link(sec_path, l_path, 0); 314 } 315 316 if ((flags & RM_STALE) == RM_STALE) { 317 (void) strcpy(stale_re, "^"); 318 (void) strcat(stale_re, dir); 319 (void) strcat(stale_re, "/c"); 320 (void) strcat(stale_re, ctrl); 321 (void) strcat(stale_re, "t[0-9A-F]+d[0-9]+(s[0-9]+)?$"); 322 /* 323 * optimizations are made inside of devfsadm_rm_stale_links 324 * instead of before calling the function, as it always 325 * needs to add the valid link to the cache. 326 */ 327 devfsadm_rm_stale_links(stale_re, l_path, node, minor); 328 } 329 330 free(ctrl); 331} 332 333 334/* index of enumeration rule applicable to this module */ 335#define RULE_INDEX 0 336 337static char * 338diskctrl(di_node_t node, di_minor_t minor) 339{ 340 char path[PATH_MAX + 1]; 341 char *devfspath; 342 char *buf, *mn; 343 344 devfsadm_enumerate_t rules[3] = { 345 {"^r?dsk$/^c([0-9]+)", 1, MATCH_PARENT}, 346 {"^cfg$/^c([0-9]+)$", 1, MATCH_ADDR}, 347 {"^scsi$/^.+$/^c([0-9]+)", 1, MATCH_PARENT} 348 }; 349 350 mn = di_minor_name(minor); 351 352 if ((devfspath = di_devfs_path(node)) == NULL) { 353 return (NULL); 354 } 355 (void) strcpy(path, devfspath); 356 (void) strcat(path, ":"); 357 (void) strcat(path, mn); 358 di_devfs_path_free(devfspath); 359 360 /* 361 * Use controller component of disk path 362 */ 363 if (disk_enumerate_int(path, RULE_INDEX, &buf, rules, 3) == 364 DEVFSADM_MULTIPLE) { 365 366 /* 367 * We failed because there are multiple logical controller 368 * numbers for a single physical controller. If we use node 369 * name also in the match it should fix this and only find one 370 * logical controller. (See 4045879). 371 * NOTE: Rules for controllers are not changed, as there is 372 * no unique controller number for them in this case. 373 * 374 * MATCH_UNCACHED flag is private to the "disks" and "sgen" 375 * modules. NOT to be used by other modules. 376 */ 377 378 rules[0].flags = MATCH_NODE | MATCH_UNCACHED; /* disks */ 379 rules[2].flags = MATCH_NODE | MATCH_UNCACHED; /* generic scsi */ 380 if (devfsadm_enumerate_int(path, RULE_INDEX, &buf, rules, 3)) { 381 return (NULL); 382 } 383 } 384 385 return (buf); 386} 387 388typedef struct dvlist { 389 char *dv_link; 390 struct dvlist *dv_next; 391} dvlist_t; 392 393static void 394free_dvlist(dvlist_t **pp) 395{ 396 dvlist_t *entry; 397 398 while (*pp) { 399 entry = *pp; 400 *pp = entry->dv_next; 401 assert(entry->dv_link); 402 free(entry->dv_link); 403 free(entry); 404 } 405} 406static int 407dvlink_cb(di_devlink_t devlink, void *arg) 408{ 409 char *path; 410 char *can_path; 411 dvlist_t **pp = (dvlist_t **)arg; 412 dvlist_t *entry = NULL; 413 414 entry = calloc(1, sizeof (dvlist_t)); 415 if (entry == NULL) { 416 devfsadm_errprint("%s: calloc failed\n", modname); 417 goto error; 418 } 419 420 path = (char *)di_devlink_path(devlink); 421 assert(path); 422 if (path == NULL) { 423 devfsadm_errprint("%s: di_devlink_path() returned NULL\n", 424 modname); 425 goto error; 426 } 427 428 devfsadm_print(disk_mid, "%s: found link %s in reverse link cache\n", 429 modname, path); 430 431 /* 432 * Return linkname in canonical form i.e. without the 433 * "/dev/" prefix 434 */ 435 can_path = strstr(path, "/dev/"); 436 if (can_path == NULL) { 437 devfsadm_errprint("%s: devlink path %s has no /dev/\n", 438 modname, path); 439 goto error; 440 } 441 442 entry->dv_link = s_strdup(can_path + strlen("/dev/")); 443 entry->dv_next = *pp; 444 *pp = entry; 445 446 return (DI_WALK_CONTINUE); 447 448error: 449 free(entry); 450 free_dvlist(pp); 451 *pp = NULL; 452 return (DI_WALK_TERMINATE); 453} 454 455/* 456 * Returns success only if all goes well. If there is no matching reserved link 457 * or if there is an error, we assume no match. It is better to err on the side 458 * of caution by creating extra links than to miss out creating a required link. 459 */ 460static int 461reserved_links_exist(di_node_t node, di_minor_t minor, int nflags) 462{ 463 di_devlink_handle_t dvlink_cache = devfsadm_devlink_cache(); 464 char phys_path[PATH_MAX]; 465 char *minor_path; 466 dvlist_t *head; 467 dvlist_t *entry; 468 char *s; 469 char l[PATH_MAX]; 470 int switch_link = 0; 471 struct stat sb; 472 char *mn = di_minor_name(minor); 473 474 if (dvlink_cache == NULL || mn == NULL) { 475 devfsadm_errprint("%s: No minor or devlink cache\n", modname); 476 return (DEVFSADM_FAILURE); 477 } 478 479 if (stat(ENUMERATE_RESERVED, &sb) == -1) { 480 devfsadm_print(disk_mid, "%s: No reserved file: %s. Will " 481 "not bypass new link creation\n", 482 modname, ENUMERATE_RESERVED); 483 return (DEVFSADM_FAILURE); 484 } 485 486 minor_path = di_devfs_minor_path(minor); 487 if (minor_path == NULL) { 488 devfsadm_errprint("%s: di_devfs_minor_path failed\n", modname); 489 return (DEVFSADM_FAILURE); 490 } 491 492 (void) strlcpy(phys_path, minor_path, sizeof (phys_path)); 493 494 di_devfs_path_free(minor_path); 495 496 head = NULL; 497 (void) di_devlink_cache_walk(dvlink_cache, DISK_LINK_RE, phys_path, 498 DI_PRIMARY_LINK, &head, dvlink_cb); 499 500 /* 501 * We may be switching between EFI label and SMI label in which case 502 * we only have minors of the other type. 503 */ 504 if (head == NULL && (*mn == *(MN_SMI) || 505 (strncmp(mn, MN_EFI, 2) == 0))) { 506 devfsadm_print(disk_mid, "%s: No links for minor %s in /dev. " 507 "Trying another label\n", modname, mn); 508 s = strrchr(phys_path, ':'); 509 if (s == NULL) { 510 devfsadm_errprint("%s: invalid minor path: %s\n", 511 modname, phys_path); 512 return (DEVFSADM_FAILURE); 513 } 514 (void) snprintf(s+1, sizeof (phys_path) - (s + 1 - phys_path), 515 "%s%s", *mn == *(MN_SMI) ? MN_EFI : MN_SMI, 516 strstr(s, ",raw") ? ",raw" : ""); 517 (void) di_devlink_cache_walk(dvlink_cache, DISK_LINK_RE, 518 phys_path, DI_PRIMARY_LINK, &head, dvlink_cb); 519 } 520 521 if (head == NULL) { 522 devfsadm_print(disk_mid, "%s: minor %s has no links in /dev\n", 523 modname, phys_path); 524 /* no links on disk */ 525 return (DEVFSADM_FAILURE); 526 } 527 528 /* 529 * It suffices to use 1 link to this minor, since 530 * we are matching with reserved IDs on the basis of 531 * the controller number which will be the same for 532 * all links to this minor. 533 */ 534 if (!devfsadm_is_reserved(disks_re_array, head->dv_link)) { 535 /* not reserved links */ 536 devfsadm_print(disk_mid, "%s: devlink %s and its minor " 537 "are NOT reserved\n", modname, head->dv_link); 538 free_dvlist(&head); 539 return (DEVFSADM_FAILURE); 540 } 541 542 devfsadm_print(disk_mid, "%s: devlink %s and its minor are on " 543 "reserved list\n", modname, head->dv_link); 544 545 /* 546 * Switch between SMI and EFI labels if required 547 */ 548 switch_link = 0; 549 if (*mn == *(MN_SMI) || (strncmp(mn, MN_EFI, 2) == 0)) { 550 for (entry = head; entry; entry = entry->dv_next) { 551 s = strrchr(entry->dv_link, '/'); 552 assert(s); 553 if (s == NULL) { 554 devfsadm_errprint("%s: disk link %s has no " 555 "directory\n", modname, entry->dv_link); 556 continue; 557 } 558 if (*mn == *(MN_SMI) && strchr(s, 's') == NULL) { 559 (void) snprintf(l, sizeof (l), "%s%s", 560 entry->dv_link, SLICE_SMI); 561 switch_link = 1; 562 devfsadm_print(disk_mid, "%s: switching " 563 "reserved link from EFI to SMI label. " 564 "New link is %s\n", modname, l); 565 } else if (strncmp(mn, MN_EFI, 2) == 0 && 566 (s = strchr(s, 's'))) { 567 *s = '\0'; 568 (void) snprintf(l, sizeof (l), "%s", 569 entry->dv_link); 570 *s = 's'; 571 switch_link = 1; 572 devfsadm_print(disk_mid, "%s: switching " 573 "reserved link from SMI to EFI label. " 574 "New link is %s\n", modname, l); 575 } 576 if (switch_link) { 577 devfsadm_print(disk_mid, "%s: switching " 578 "link: deleting %s and creating %s\n", 579 modname, entry->dv_link, l); 580 devfsadm_rm_link(entry->dv_link); 581 (void) devfsadm_mklink(l, node, minor, nflags); 582 } 583 } 584 } 585 free_dvlist(&head); 586 587 /* 588 * return SUCCESS to indicate that new links to this minor should not 589 * be created so that only compatibility links to this minor remain. 590 */ 591 return (DEVFSADM_SUCCESS); 592} 593